Effect of Donepezil on Cognition in Parkinson's Disease With Mild Cognitive Impairment (PD-MCI)

Phase 2

• Conditions: Parkinson's Disease
• Interventions: Drug: Donepezil

• Registration Number: NCT02450786
• Lead Sponsor: Yonsei University

Brief Summary

There have been growing interest in identifying Parkinson's disease (PD) patients with mild cognitive impairment (MCI) which is susceptible to progress to PD dementia(PDD). PD-MCI is known to significantly correlates with low cerebrospinal beta-amyloid 1-42 and 1-40 levels, in which suggest the existence of something common with Alzheimer's dementia. PDD have showed more cholinergic deficits than Alzheimer's dementia and responds to donepezil. The investigators assume that PD-MCI patients also have cholinergic deficits. Donepezil improves cognition, and seems to be well tolerated and not to worsen parkinsonism in patients with cognitive impairment. Donepezil produced similar improvements in cognition and behaviour in DLB and PDD. This supports the hypothesis that the two disorders are closely related clinically and neurobiologically. Larger scale, placebo controlled clinical trials are needed to provide an evidence base to guide the clinical use of cholinesterase inhibitors in Lewy body disease.

It is believed that earlier intervention, later appearance of dementia should be needed to lower the socioeconomic costs and to improve the quality of life on patients and caregivers. The investigators anticipate that donepezil may delay the development of dementia in patients with PD-MCI.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2015-05-14
• Study First Submitted QC: 2015-05-18
• Study First Posted: 2015-05-21
• Study Start: 2015-06
• Status Verified: 2019-01
• Last Update Submitted: 2019-01-25
• Last Update Posted: 2019-01-29
• Primary Completion: 2019-08
• Study Completion: 2019-08

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 80

Inclusion Criteria

• Age more than 40 years old
• Clinical diagnosis of PD established by Queen Square Brain Bank Criteria
• Stable dose of levodopa at least 3 months before the study enrollment
• Diagnosis of MCI in PD according to the Movement Disorder Society (MDS) task force guideline

Exclusion Criteria

• Diagnosis of Dementia
• Hypersensitivity to piperidine derivatives
• Concomitant anticholinergics and cholinergic agents
• Severe cardiac arrhythmia: Sick sinus syndrome, complete AV block, Uncontrolled arrhythmia, history of ventricular fibrillation

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Donepezil group	Donepezil	Donepezil is started in 5mg for 8 weeks followed by dose escalation to 10mg and then maintained for 40 weeks. Participants who are not tolerable to dose of 10mg due to any issues of adverse effects would be maintained with donepezil 5mg exclusively in remained period.

Primary Outcome Measures

Name	Time	Method
Rate of cognitive decline	at 48wks	Korean Version of Mini-Mental State Exam

Secondary Outcome Measures

Name	Time	Method
Comprehensive neuropsychological test	48wks	Seoul Neuropsychological Screening Battery (SNSB)
changes of cognitive decline	baseline, 24 wks, 48 wks, 72 wks
changes of Parkinson's disease motor scale	baseline, 24 wks, 48 wks, 72wks	UPDRS part I-IV
Brain structure (cortical thickness and subcortical volume/shape) and Default mode network	48wks	Conventional and functional brian MRI
brain functional connectivity	48wks	digital electroencephalography

Trial Locations

Locations (1)

Severance Hospital; 🇰🇷 Seoul, Korea, Republic of